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Dissociative multi-photon ionization of isolated uracil and uracil-adenine complexes

Ryszka, M., Pandey, R., Rizk, C., Tabet, J., Barc, B., Dampc, M., Mason, Nigel, Eden, S. (2016) Dissociative multi-photon ionization of isolated uracil and uracil-adenine complexes. International Journal of Mass Spectrometry, 396 . pp. 48-54. ISSN 1387-3806. (doi:10.1016/j.ijms.2015.12.006) (KAR id:74667)

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Recent multi-photon ionization (MPI) experiments on uracil revealed a fragment ion at m/z 84 that was proposed as a potential marker for ring opening in the electronically excited neutral molecule. The present MPI measurements on deuterated uracil identify the fragment as C3H4N2O+ (uracil+ less CO), a plausible dissociative ionization product from the theoretically predicted open-ring isomer. Equivalent measurements on thymine do not reveal an analogous CO loss channel, suggesting greater stability of the excited DNA base. MPI and electron impact ionization experiments have been carried out on uracil-adenine clusters in order to better understand the radiation response of uracil within RNA. Evidence for C3H4N2O+ production from multi-photon-ionized uracil-adenine clusters is tentatively attributed to a significant population of π-stacked configurations in the neutral beam.

Item Type: Article
DOI/Identification number: 10.1016/j.ijms.2015.12.006
Uncontrolled keywords: Adenine-uracil clusters, Electron impact ionization, Fragmentation, Mass spectrometry, Multi-photon ionization, Uracil
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Nigel Mason
Date Deposited: 02 Jul 2019 14:59 UTC
Last Modified: 02 Jul 2019 14:59 UTC
Resource URI: (The current URI for this page, for reference purposes)
Mason, Nigel:
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